Process of making key bolts



A. H. WESTON AND J. ZILLIOX.

PROCESS OF MAKING KEY BOLTS. IIIIIIIIIIIIIII D OCT. 22. 1920.

Patented Jan. W, 11922,

2 EEEEEEEEEEEE 1- A.'H. WESTON AND J. ZILLIOX.

PROCESS OF MAKING KEY sous.

APPLICATION FILED OCT- 22, I920.

LQQ3 3G5 Patented. Jan. 10, 1922.

2 SHEETS-SHEET 2.

HHIHHHII u' l l m 9 INVENTURE- QHWMW sir ALGNZO H. WESTON AND'JOHN ZILLIOX, OF BUFFALO, NEW? YORK, ASSIGNORS '20 KEY oars-ca BOLT APPLIANCE COMPANY. OF BUFFALO, NEW' YORK.

riroonss on MAKING KEY some.

naoasee.

To all 1071. 0m a may concern Be it known that we, ALoNzo H. \VEsToN and JOHN ZinLio'x, both of the city of Buffalo, in the county of Erie, State of New York, United States of America, have invented certain new and l useful, improvements in Processes of Making Key Bolts, of which the following is a specification.

This invention relates to bolts of the type with which a key passing'through a slot in the bolt is used instead of a nut. Such bolts have been made by bending upon itselfa suitable shaped blank and subsequently forming up the head in suitable dies. See, for or} ample, thebolts described in United States Letters Patent 1,000,445 of August 15th, 1911, and 1,266,834 of May lslth, 1918.-

The manufacture of bolts in accordance with the prior art necessitated not only the original rolling of the metal for the blank to a given cross-section, but also a further rolling or shaping of the blank to change its form in longitudinal section or in cross section or in both.

This is a fairly satisfactory process if bolts of but one diameter are being'made, but when bolts of a number'of different diameters are required and of difierent lengths for each diameter, the provision of rolls for so many difierent sizes involves too great a capital outlay. I

Our object in the present invention, therefore, is todevise a process of making such bolts which will enable us to produce'the bolts from metal bars of uniform crosssection, inclusive of bars of standard sizes and shapes such as are obtainable in the open market, without subjecting them to special rolling 0r shaping processes previous to the bending and heading operations.

l/Ve attain our object by bending on itself a straight metal bar of suitable cross-section to bring its parts into proximity but separated, adjacent the bend at least, by a space substantially equal to the desired width of the slot. The blank is then enclosed in die of the desired size and shape of the finished bolt provided with a form which passes between the parts of the blank to maintain the slot during the succeeding operations.

The ends of the parts of the blank are left projecting, and are then upset to displace the metal thereof longitudinally to substantially fill the die and thus form the unslotted portion of the stem of the bolt.

Specification of Letters Patent.

Patented as. to; i922.

Application filed October 22, 1920. Serial n6. aisfiesi suits are attained, particularly if a round headed boltis required, by having the die which displaces the'me'tal longitudinally only partly shape the head, the final shape being given by a separate die in a separate operation.

Th details of the process are hereinafter more fully described and'the apparatus employed therein illustrated in the accompanying drawings in which- Fig. 1 is afront elevation of apparatus for bending the blanks;

Fig. 2 a side elevation of the same;

Fig. 3 a plan view of the same partly in section;

Fig. 4 a side elevation of the finished bolt;

Fig. 5 a plan view of the same;

Fig. 6 a cross section of the same on the line wb in Fig. 5;

Fig. 7 a longitudinal section of the apparatus for upsetting and heading the bolt;

Fig. 8 a transverse section of the holding die; and

Fig. 9 a longitudinal section of a bolt illustrating its method of use.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

Referring particularly to Figs. 1, 2 and 3, l is a mandrel on which the blank 14 in the first placev is laid as shown in full lines. 2 are rolls journalled on a head 3, which head in practice will be suitably supported to reciprocate the rolls on each side of the mandrel, these rolls, coming into contact with the blank, bend it over the mandrel as indicated in dotted lines, thus bringing its parts into substantial parallelism.

The blank 14 is shown in the drawings as being formed of substantially half round stock of substantially the same cross section at all parts of its length. It must be kept in mind, however, that the process illustrated is applicable to many other forms of blank than that shown, the usual limitation, however, of the form' of the blank beingthat its cross sectionshall be substantially that of half the slotted portion of the stem of the bolt less half the cross sectional area of the slot.

For certain purposes, which will hereinafter appear, it is desirable that the blank along the crown of its rounded side should be flattened or deformed. This is preferably .efi'ectedby forming a flat 4 in the bottom of the groove of each of the rolls 2'.

The deformation of the blank is thus effected by pressure between the rolls and the mandrel 1. The bent blank is removed from the mandrel and placed in a holding die '5.

-To facilitate the introduction and "removal of theblank, the die will usually be divided on the plane 0 d, that is, me plane at right angles to the plane of the slot of the finished bolt. In this die, the blank is securely gripped. No means are shown for 1 clamping the parts of the die together, but any ordinary devices would be used for this P p a In connection with each die we provide a form to maintain the slot in the slotted por tion of the stem of the bolt. Usually this form will be provided by the lugs 6, one formed integrally with each half ofthe die, which lugs are preferablyslightly tapered in cross section to facilitate their disengage ment from the slot in thefi-nished bolt- It will be noted that the ends 7 of the two parts of the blank project from the die. (lo-operating with the die is an upsetting'die 8 havinga recess 9 formed therein-adapted to engage the opposedends 7 of the blank n will be noted that'in Fig. 7. a double die 5 is illustrated and the upsetting die con-v tains also a recess 10 of the desired shape of the finished head. After the first, upsetting operation, the position of the upsetting die 8 is changed to bring the recess 10 into aline-I ment with the partially formed head' The second blow of the upsetting die thenfinishes the head to substantially. the shape shown in--Figs. 4i and 5 of the drawings. The die is then opened up and the finished bolt removed.

For many purposes, a straight cylindrical bolt is desired and we have illustrated the formation of such a bolt. It will be understood, however, that this method of producing a substantially unslotted portion of the stem of the bolt by flowing the metal. of the projecting ends into the die is adapted to the formation of bolts of almost any form of cross section and of various shapes longitudinally other than cylindricalr Further, heads of any desired pattern may be formed on the bolts as may be desired;

substantial gripping of the blank in theholding die during the upsetting operation results in a slight increase in the thickness in the bend of the metal at the end of the bolt which is a desirable characteristic. The bolt will be absolutely true in external contours, which is an important feature in shipbuilding operations, or other constructional work in drawing together plates 13 as in.

dicated-in Fig. 9. M I

Owlng to the deformatlon of the crown of the blank 1n the bending operation as hereinbefore referred to, a small space isjle'ft between the blank and the holding die at each side at points remote from the division of the diet This provides room into which a flow of metal can take place duringtl e. upsetting and heading operations. wise some tendency exists for the formathertion of slight fins or flashes along the sides I of the bolt in line with the division between the parts of the die. 7 V I While ina bolt formed as shown, there is slightly less cross sectional area of metal in the slotted portion of thestem of the bolt than in the cross section at the bottom'of the, threads of a bolt threaded with the United States standard thread for the specific bolt diameter, yet owing to the fact that we can employ in the formation ofthe bolt a steel of such high. carbon content that a screw thread cannot be cut therein, a bolt is produced which is of greater strength than threaded bolts as ordinarilyemployed. 1

The bending and upsetting operations will usually take place while themetal at about a cherry red heat.

What we claim as our invention is :j y 1. A process of forming a key bolt with a non-slotted stem portion adjacent one end and a slotted portion adjacent the other end which consists informing a blank by bending on itself a metal bar tobring itsparts in proximity to one another; and upsetting the free ends of the parts of the blank sufliciently to formthe non-slotted portion of the bolt. r 5

2. A process of forming a key bolt with a non-slotted stem-v portion adjacent one end and a. slotted portion adjacent the othen end which consists in forming a blank by bending on itself a metal bar to bring .its parts in proximity to one another; and upsetting the free ends or" the ports of the blank suti ciently to form the non-slotted portion of the bolt and a head.

3 A process of forming a lrey bolt vith a non-slotted stern portion adjacentone end and a slotted portion adjacent the other end which consists in forming a blank by bending on itself metal bar to bring its par s-in proximity to one another; and upsett "free ends of the parts of the blank suinciently to form the non-slotted portion of the bolt and further upsetting the said ends in separate operation to shape the head of the bolt.

4. A process of forming a lreybolt with :1 non-slotted stem portion adjacent one end and a slotted portion adjacent the other end Which consists in forming" a blank by bending on itseli a metal bar to bring its parts in proximity to one enother; holding the blank in a suitable enclosinq' die and defining and maintaining the slot by means of a trans verse form; and upsetting" the free ends of the parts of the blank sutliciently to form the non-slotted portion of the bolt.

5, A process of forming a key bolt with a non-slotted stem portion adjacent one end and a slotted portion adjacent the other end which consists in forming a blank by bond ing on itself a metal bar of substantially the same cross sectional contour at all parts of its length so as to bring its parts in proximity to one another; and upsetting the free ends oi the parts of the blank suificiently to form the non-slotted portion of the bolt.

6. A process 01 forming a key bolt with a non-slotted stem portion eojecent one end and a slotted portion adjacent the other end Which consists in forming a blank ly bending on itself a metal bar to bring its parts in proximity to one another; holding the blank in suitable enclosing die, which is divided longitudinally in a plane parallel to the the sides of the slot, and defining and maintoining the slot by means of a transverse form; and upsetting the free ends of the parts of the blank sul'liciently to term the non-slotted portion of the bolt the blank previous to its enclosure in the die being shaped to provide slight clearance between itseli end the di longitudinally of the latter and remote from the plane of division.

7. A orocess of forming a lrey bolt with n non-slotted stem portion adjacent one end and a slotted portion adjacent the other end which consists in forming a b12111: by bending on itself a metal her to bring its parts in proximity to one another and compressing the blenlr endwise in a die having the form desired for the external contours of the finished bolt and having a transverse form to define and maintain the slot.

igned at Bullalo, N. Y., this 7th day of October, 1920.

ALUNZU H. WESTON. JOHN ZILLIOX. 

